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A wave is an energy-carrying disturbance in a medium that does not involve any net particle movement. It can take the form of elastic deformation, a change in pressure, electric or magnetic intensity, electric potential, or temperature. There are several types of waves such as, transverse waves, longitudinal waves, electromagnetic waves, mechanical waves and matter waves. Here, we will learn more about the types of waves and discuss some important questions.
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What are Waves?
A wave is a disturbance in which energy is transferred from one location to another. During wave propagation, the medium's particles vibrate. The particles in a transverse wave shake up and down and are perpendicular to the wave's propagation direction. The particles vibrate in a longitudinal wave in the direction of wave propagation.
A wave is an oscillating flow or transfer of energy via a medium such as space or mass. Sea waves or tides, a sound we hear, a photon of light travelling, and even the movement of little plants blown by the wind are all examples of waves.
Waves
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Types of Waves Detailed Video Explanation:
Read More: Wave Optics
Important Terms
Some of the most used yet useful terms are listed below,
- Wavelength- A progressive wave's wavelength is the distance between two consecutive points of the same phase at the same time. It is twice the distance between two successive nodes or antinodes in a stationary wave. It is denoted by λ.
- Amplitude- The biggest deviation from the neutral position is called amplitude. This symbolizes the wave's energy. The amplitude of a wave carries more energy.
- Displacement- The position of a particular point in the medium as it moves when the wave passes is referred to as displacement.
- Crest- The largest value of upward displacement within a cycle is the crest point of a wave.
- Trough- The smallest or lowest point in a cycle is called a trough since it is the inverse of a crest.
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Types of Waves
There are different types of waves- Electromagnetic, Mechanical and Matter Waves. These are discussed in details-
Mechanical Waves
- A mechanical wave is a wave that is caused by matter oscillations and is responsible for energy transfer via a medium.
- The transmission medium limits the wave's propagation distance.
- The oscillating material in this scenario moves around a fixed point with very minimal translational motion.
- The way mechanical waves are measured, which is displacement divided by wavelength, is a fascinating feature.
- Harmonic effects are formed when this dimensionless factor is 1; for example, when this factor exceeds 1, turbulence ensues.
- Transverse and Longitudinal waves are the two types of mechanical waves.
- Transverse Waves- Waves in which the medium flows perpendicular to the wave's direction. Light waves, S-wave seismic waves, Stringed instruments, and Torsion waves are some of the examples.
- Longitudinal Waves- In a longitudinal wave, the particles in the medium move in the same dimension as the wave's movement direction. Sound waves, P-type earthquake waves, and compression waves are examples of longitudinal waves.
- Longitudinal waves have two components: compression and rarefaction.
- Compression- where the particles are close together is a portion of longitudinal waves.
- Rarefaction- is the separation of particles.
- Water waves are a good example of a motion that is both longitudinal and transverse.
- Surface waves - Particles move in a circular manner in this type. These waves are most common at interfaces. Ocean waves and ripples in a cup of water are both instances of such waves.
Mechanical Waves
Matter Waves
- Matter waves, which are an example of wave–particle duality, are an important aspect of quantum mechanics theory.
- All stuff behaves in a wave-like manner. A beam of electrons, for example, can be diffracted in the same way that a beam of light or a water wave can.
Electromagnetic Waves
- The merger of electric and magnetic forces produces electromagnetic waves. Electromagnetic waves are responsible for the light you see and the colours you see around you.
- Electromagnetic waves, unlike mechanical waves, do not require the presence of a medium in order to travel. In a vacuum, all electromagnetic waves travel at the same speed of 299,792,458 ms-1.
- The various types of electromagnetic waves are as follows: Microwaves, X-ray, Waves of radio, Ultraviolet radiation.
- These waves are disturbances that may readily move through the vacuum and do not require any object medium for propagation.
- They're created by a variety of magnetic and electric fields. Changes in magnetic electric fields that occur on a regular basis.
Difference between Mechanical and Non-Mechanical Waves
Some of the key differences between Mechanical and Non Mechanical waves are tabulated below for your reference,
| Mechanical Waves | Non-Mechanical Waves |
|---|---|
| Vacuum does not allow mechanical waves to travel. | Vacuum does allow non-mechanical waves to travel. |
| Mechanical waves are sound waves, water waves, and seismic waves, to name a few. | Only the electromagnetic wave is not mechanical. |
| Mechanical waves are waves that must travel across a medium. | Waves that do not require a medium to propagate are known as non-mechanical waves. |
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Things to Remember
- A wave is an energy-carrying disturbance in a medium that does not involve any net particle movement.
- There are various sorts of waves-Transverse Waves, Longitudinal Wave, Electromagnetic Waves, Mechanical waves and Matter Waves.
- A progressive wave's wavelength is the distance between two consecutive points of the same phase at the same time.
- The biggest deviation from the neutral position is called amplitude.
- The position of a particular point in the medium as it moves when the wave passes is referred to as displacement.
- The smallest or lowest point in a cycle is called a trough.
- A mechanical wave is a wave that is caused by matter oscillations and is responsible for energy transfer via a medium.
- Transverse Waves are the waves in which the medium flows perpendicular to the wave's direction.
- In longitudinal waves, the movement of the particles in the medium is in the same dimension as the wave's movement direction.
- Particles move in a circular manner in Surface wave type.
- Electromagnetic waves do not require the presence of a medium in order to travel.
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Sample Questions
Ques: What is the definition of wavelength? What's the link between frequency and speed? (2 marks)
Ans: Wavelength is the distance between two consecutive points of the same phase at the same time. Wavelength is inversely related to frequency of a sinusoidal wave flowing at a constant speed: waves with higher frequencies have shorter wavelengths, whereas waves with lower frequencies have longer wavelengths.
Ques: In a vacuum, how do electromagnetic waves travel? (3 marks)
Ans: Electromagnetic waves do not require a medium to travel; they can simply pass through vacuum, which is close to it. From the source of the disturbance, electromagnetic waves radiate outward in all directions. The waves then continue to move until they are disrupted by anything. The further the waves travel from their source, the more spread out they get, resulting in fewer waves in a given area and less energy transfer.
Ques: Why are Sound Waves called Mechanical Waves? (3 marks)
Ans: A mechanical wave is defined by the fact that it must propagate through a material medium such as air, water, or metals. The propagation of sound waves necessitates the use of a medium. When sound waves travel through the air, pressure changes occur, with high-pressure zones referred to as compressions and low-pressure regions referred to as rarefaction.
Ques: What specifically is oscillation? How Do Electromagnetic Waves Emerge From Oscillating Charge? (4 marks)
Ans: Oscillations are periodic variations in a physical property over a long period of time. These motions include those that occur on a regular basis around an idle position. The harmonic vibration is the most important vibration type; this periodic change in a physical property is sinusoidal. In space, an oscillating charge generates an oscillating electric field, which generates an oscillating magnetic field. The oscillating electric and magnetic fields regenerate each other, causing waves to form in the vicinity.
Ques: Why are transverse waves unable to pass through fluids? (2 marks)
Ans: Waves in which the displacement of the medium is perpendicular to the wave's propagation direction are known as transverse waves. Because there is no mechanism to drive motion perpendicular to the wave's propagation, transverse waves cannot travel in liquid.
Ques: Name the seven types of electromagnetic waves and their applications? (4 marks)
Ans: The seven types of electromagnetic waves and their applications are-
- Radio waves: used for Communication
- Microwaves: used for Data transfer and heating
- Infrared rays: used for remote control and imaging.
- Visible light: Assists us in seeing all that is going on around us.
- Ultraviolet Waves: are useful in galaxy research.
- X-rays: used in medical devices that are used to examine the structure of bones.
- Gamma rays: used in Nuclear energy.
Ques: Do longitudinal waves move quicker than transverse waves? If not, why not? (3 marks)
Ans: Transverse wave transmission is faster than longitudinal wave transmission. During an earthquake, the difference in speed between the longitudinal and transverse waves can be seen. Both longitudinal and transverse waves are produced during an earthquake. A P-wave is the first tremor that occurs before the major tremor during an earthquake. It is longitudinal in character. An S-wave is a large tremor that occurs after the initial tremor.
Ques: What's the distinction between S- and P-waves? (3 marks)
Ans: P-waves: These waves are also known as main waves. They are the first to reach the surface because they move faster. Sound waves are similar to P-waves. They move through materials that are gaseous, liquid, and solid.
S-waves: Secondary waves are also known as S-waves. They arrive at the surface once a certain amount of time has passed. They can only move through solid objects.
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